Belt-tightener.



A. F. Kwls. BELT TIGHTENBR. APPLICATION FILED` JUNE 8, 1906.

Patented June I7,1910.

I 35 2 SHEETS-SHEET 1.

v A. F. KWIS- BELT TIGHTENEB.. APPLICATION FILED .TUNE B, 1906. 966,347. Patented June 7,1910.

2 SHEETS-SHEET Z.

Arthur- F'IKws INVEN'TQR.

UNITED sTAriisnii/ENT OFFICE.

ARTHUR F. KWIS, OF NORWOOD, OHIO, A SSIGNORTO ALLIS-CHALMERS COMPANY, A. CORPORATION OF NEW JERSEY, AND THE BULLOCK ELECTRIC MANUFACTURING COMPANY, Al CORPORATION OF OHIO.

BELTTIGHTENER.`

Specification of Letters Patent. Patnted June 7, 1910.

Appncation'fned June 8,1906, seria1No.a2o,737.

' To all whom 'it may concern."

and especially to belt-tighten'ers adapted forA use'in connection with electric motors,

although this invention is not limited in its4 application to such ilse. Frequently small high speedmotors are employed for drivingI machine or shaftpulleys 'the speeds of which are required to be much lower than the speeds of the motors.' It is necessary therefore to employ a. pulley on the motor shaft much smaller than the di'iveii pulley. If the difference in the diameters of the pulleys is great, there will be small angle of contact between the motor pulley and the driven belt especially it' the belt is short. 'lherefo'rtn there may be mnsiderablc slip between. the. motor pulleyand they belt. and` V if the 'loadlis very great, the motor will-be unable to drive the belt at all, unless a belttightener or idler pulley is employed for in f creasing the contact surface between Athe motor pulley and the belt. y

One of the 4objects of my invention is to' provide a vbelt-tightener for an electric motor which may be applied to an ordinary standard motor casing without in any way ne# beltrtightener comprising an arm or frame. pivoted to a support and carrying at its' outer end an idler pulley, which arm is `yieldinlgfly pressed .downward to 'ard the belt by a spring having an abutment also on 'the support, which abutment may be adjusted to any desired angular position to ad- ]ust the tensionv of the pulley on lthe belt or 'to adjust t'li'e position -of the idler pulley.

In another aspect my invention consists in-an electric -motor comprising` a frame or yoke, and an end-head secured to they frame or yoke by a plurality of bolts, one of which.y

projects outwardfrom the end-liead. a belt tighteiter mounted onsaid outwardly pi'ojecting bolt, said belt ltightener comprising a pivoted spring pressed arm having an idler pulley on its outer free end, and means for adjusting the position of the pulley.

l\Iy iiivent-ion still further consists inthe details of construction andthe combinations of elei'nents described in the specification and set forth in the appended claims.`

For a. better` understanding of my invention, reference is had to the accompanying drawings in whiclij Figure lI is a partial end elevation of a .motor equipped with one of my improved belt tigliteners, part of the belt tightener being shown in section; Fig. Q'is a plan view of the saine, parts being broken away: Fig. 3 is an end elevation of the motor and .belt tightener on a slightly reduced scale. the belt tightener being;r shown in a different position from lthat shown in Fig. 1 Fig. Jr is an encl elevation ofthe motor equipped with a slightly modi-lied type-of belt tightenei: and

Fig. '5A is a plan view of the belt tightener Electric motors may be placed in any position re-lative to the driven machine and pul1e v.and may be mounted on the floor or ceiling; also motors for drivingr certain kind of machines must be capable of rotating in either direction ot' rotation.` If the direction of the beltv is changed, or if the direction of the motor is' changed, of course the posi-tion of the belt tighteiier must be changed. y of adjustment for changes in position or directionY of the belt or for changes in direction of rotation of the drivinr pull-ey, it is especially adapted for' use inconneetion with electric motors, and I have therefore illustrated it as applied to such a motor.

YReferringl to the different figures of the drawing, l have' showiii at 10 a lnotor hav- As inv beltstigliteiier is capable bolts 15, being My improved belt ti htener is mounted on a special bolt or stil 18 extending outwardlya Isuitable distance from the end'- head. This bolt 18 replaces one of the usual. provided with a threaded portion 19liaving the same diameter as the olts 15, and adapted to be screwed tightly in to any one of'tlie threaded holes forthe bolts 15 so as to .assist in securing the endhead in position as ivell as supporting the belt tiglitener. This supporting bolt 18 may be 'substituted for any one of the bolts 15 and the belt tightener can thus be supported in avariety ot' positions around 'the motor pulley. The bolt'18 is provided with a shoulder 2O adapted to engage the lug on the with a comparatively long` eiid-head and cylindrical portion 2l larger in diameter than the threaded portion 19.* The bolt is also provided at its outer end with a squared oi'tion 22 by means ofv which the bolt can e screwed into position. bolt or` stud' l8 is a member lavingin this instance twok curvedor arched arms 'oined together'by a bridging member 424.v

he arms carry at-their gouter free ends a pin or stud on which is mounted an idler pulley 26 adaptedto lbear upon the belt.

Also mounted. upon the bolt or stud 18 is Wli'en thebelt tightener is mounted on the for the spring isJVA sie 4s is supported in 4member can be adjusted. It is seen t the a normally stationary member 2T having a forwardly extendino'varm .28 -andja split `collar 29 providedvwith lugs 30 and tightening bolts 31 by means of which the member 27 can be clamped on the supporting bolt. At 32 is shown a tension spring for holding the idler 'pulley yieldingly upon the belt. This s ring,` is secured at one end to the hemispliei'ical head 3340i. a bolt mounted in the outer end of the forwardly extending arm 28 of the clampin member and at its .other end tothe end o a threaded bolt 35 passing loosely through t-he bridging ortion 24; of the pivoted member. The olt position byfa nut 36, by t ie position of they ivoted adjusting which normally stationary clamping member,V 27

for'the spring 32.

bolt or stud the abutment clam d in'such a position as will approxiT mate y give the proper tension of the spring' and hence the-prop1er pressure of the` plley upon the belt. T can'then be adjusted to obtain the exact desired 'QI'. necessary; ressure'of the pulley on the vbelt. If it is esired to adjust the posi tion of the pulley a considerable extent, the abutment can be adjusted on the bolt yby loosenin the bolts 31 in the split clamping collar. fthe position of the motor \r the .direction of the belt is different from that shown in Fig. 1, vthe bolt 18 may be supported 'in another position." With the-motor construction here'shownthe bolt or stud 4on Iivoted on the e n-ut 36 on the bolt 35,/

.which the 'belt tig] `placed in four-dill .3 the belt tightener is shown in the itener is mounted may be In Fig. PI'OPS' position when the direction of the movement ofthe beltl vis reversed with respect to that shown in Fig. 1.

'ei-ent positions.`

In F'gs. 4 and 5 is shown a slight modi# fication of my invention. The belt tightener here shown dill'ers from that above de-A scribed in the clamping nieans forthe stationary member Which forms the abutment for the spring. In this case the bolt orstud 1S upon which the belt: tidhtener is mounted is kprovided with a large number of grooves or slots 3T. 'Ihe stationary member 2T instead of being providedA ywith a split` clamping collar 2S as in the first ease is i-n the form vof a complete sleeve or collar adapted to be slipped onto the grooved poi'- tion ofthe bolt and. to be held in position by means ofa set screw 35 adapted to tit in any one of the grooves or slots in the bolt. This construction may be' preferable in case the tension of the spring is considerable to avoid any danger of the abutment slipping on thesupporting vst iid or bolt.

y lItis seen that my belt tightener can be mounted on a motor casing without in any. y

way changing the easing or v without requirl ing any v.special construction of the latter.

Fnrtlierinore. vthe belt tightener canA be adjusted foifany positionof the belt or direction'- of i'otatioiiand` forany `desired pressure of the pull-ey .opoiithe belt.

Many changes .can beiinade in the details of construction` "without-3 involving a departure from the spirit and scope of my inventiomaud I do not wisli to be confined in m plaiins to the specific details shown.

W' at I claim as new and desire to secure by Letters Patent is v 1. In combination, a shaft, an idler-pulley adjacent said shaft, a pivoted supporting arm for said pulley, a normally stationary abutment, a spring between the abutment and' the pivoted supporting arm, and means whereby thev abutmentv mayy be ad'usted to any l,desired position about the fu crum of the su porting arm so as to adjust the position `o the supportingarm and of the idlerpulley. f

i io

2. In combination, a shaft, a belt tightener comprising 'a pivoted arm and an idler ulley, .a sprin 1 for--press'in the pulley yieldingly on the elt, a norma ly stationary abut.-

ment foi one end ofthe spring, and meansl for adjustingl the abutmeiitto any desired angular position about the fulcruni of said -pivotedarm.

3. In combination,

, bolt or stud, a spring between said armand a" shaft, aysiipport, a' .bolt or stud extending from said support,

izo l pivotally mounted on the bolt and being freely movable about the same relative to the abutment, and a spring between the abut-- ment and arm.

5. In combination, an electric motor, a boltor stud extending outwardly therefrom, and a belt tightener comprising an abutment, an arm movable with respect thereto and anidler-pulley carried by said arm, said arm and abutment being mounted directly lon said bolt or stud.

6. In'combination, an electric motor, Va bolt or stud extending outwardly therefrom, a belt tightener comprising an abutment, and a pivoted yieldingly held arm and an idler-pulley carriedby said arm, both said Corrections in Letters Patent No. 960,347. I

abutment and arm being mounted directly on said bolt or stud. y

' v7. In combination, an electric motor, a bolt or stud extending outwardly therefrom, vand a belt tightener comprising a spring pressed member pivoted to said bolt or stud, an idler pulley carried by said member, and

means for adjusting the belt tightener about said bolt or stud.

8. In combination, an electric motor com prising a frame and end-head, a plurality of bolts for securing said end-head to the frame, .one of said bolts extending outwardly from` the end-head, and a belt tightener comprising a pivoted -arm and an idler p ulley, said arm being mounted directly on said outwardly extending bolt.

.9. In combination, an electric motor comprising a frame and end-head, aplurality ofv bolts securing the end-head to the frame, a belt tightener comprising an idler ulley, a pivoted arm carrying said idlerpu ley, a normally stationary member, said arm andnormally stationary member being both mounted on one of said bolts, the stationary member being adjustable about the bolt on which -it is mounted and the pivoted arm being K.freely movable about the bolt relative to the normally stationary member, and a spring between the latterand the pivoted arm.

10. In combination, an electric motor, a bolt extending outwardly fron'i'the frame thereof, a belt tightener comprising a pivoted arm, an idler-pulley on the end thereof, a stationary abutment, a spring ,for yieldingly pressin the pulleyon thel belt, and means for a just-ing the tension of said spring, said pivoted arm and said stationary abutment vbeing mounted directly on said bolt. s

yIn testilnony whereof I aix my signature,

l in the presence of `two witnesses.

ARTHUR F. Kwis.

-It is hereby ceijtiedthat in Iietters Patent No. 960,347, granted .lune 7, 1910, upon the application of Arthur vF. Kwis, ofv Norwood, Ohio, for an improvement .in Belt-Tighteners,4 errors appear in theiprinted specification requiring correction as follows: Page 1, line 89, -the Words ,of rotation shouldbestricken out, and samev page, line 91, after the word directionfv the Words Qf rotation should. be inserted; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the. Patent Office.

Signed and sealed this 12th day of July,l A. D., 1,910,

C. o. BiLLINos,

Actz'ng Commissioner of Patents.

pivotally mounted on the bolt and being freely movable about the same relative to the abutment, and a spring between the abut-- ment and arm.

5. In combination, an electric motor, a boltor stud extending outwardly therefrom, and a belt tightener comprising an abutment, an arm movable with respect thereto and anidler-pulley carried by said arm, said arm and abutment being mounted directly lon said bolt or stud.

6. In'combination, an electric motor, Va bolt or stud extending outwardly therefrom, a belt tightener comprising an abutment, and a pivoted yieldingly held arm and an idler-pulley carriedby said arm, both said Corrections in Letters Patent No. 960,347. I

abutment and arm being mounted directly on said bolt or stud. y

' v7. In combination, an electric motor, a bolt or stud extending outwardly therefrom, vand a belt tightener comprising a spring pressed member pivoted to said bolt or stud, an idler pulley carried by said member, and

means for adjusting the belt tightener about said bolt or stud.

8. In combination, an electric motor com prising a frame and end-head, a plurality of bolts for securing said end-head to the frame, .one of said bolts extending outwardly from` the end-head, and a belt tightener comprising a pivoted -arm and an idler p ulley, said arm being mounted directly on said outwardly extending bolt.

.9. In combination, an electric motor comprising a frame and end-head, aplurality ofv bolts securing the end-head to the frame, a belt tightener comprising an idler ulley, a pivoted arm carrying said idlerpu ley, a normally stationary member, said arm andnormally stationary member being both mounted on one of said bolts, the stationary member being adjustable about the bolt on which -it is mounted and the pivoted arm being K.freely movable about the bolt relative to the normally stationary member, and a spring between the latterand the pivoted arm.

10. In combination, an electric motor, a bolt extending outwardly fron'i'the frame thereof, a belt tightener comprising a pivoted arm, an idler-pulley on the end thereof, a stationary abutment, a spring ,for yieldingly pressin the pulleyon thel belt, and means for a just-ing the tension of said spring, said pivoted arm and said stationary abutment vbeing mounted directly on said bolt. s

yIn testilnony whereof I aix my signature,

l in the presence of `two witnesses.

ARTHUR F. Kwis.

-It is hereby ceijtiedthat in Iietters Patent No. 960,347, granted .lune 7, 1910, upon the application of Arthur vF. Kwis, ofv Norwood, Ohio, for an improvement .in Belt-Tighteners,4 errors appear in theiprinted specification requiring correction as follows: Page 1, line 89, -the Words ,of rotation shouldbestricken out, and samev page, line 91, after the word directionfv the Words Qf rotation should. be inserted; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the. Patent Office.

Signed and sealed this 12th day of July,l A. D., 1,910,

C. o. BiLLINos,

Actz'ng Commissioner of Patents.

1t is hereby certifiedthat in Letters Patent No. 960,347, granted June 7, 1910, upon the application of Arthur F. Kwis, of Norwood, Ohio, for nn improvement in Belt-Tighteners, errors appear in the printed specification requiringr correction 11's follows: Page 1, line 89, the words of rotation should be stricken out, and same page, line 91, after the word direetion, the words Qf rotation should be inserted;

:1nd that the seid Letters Patent should be reed with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 12th day of July, A. D., 1910.

C. C. BILLINGS,

Acting 00mm z'sez'oner of Patents.

[SEAL] 

